Algae and cyanobacteria are tiny plant-like organisms that, under the right conditions, can overgrow in rivers, lakes, and oceans. This rapid growth is called an algal bloom and can be associated with foam, scum, or thick layers of algae on the surface of water. Algal blooms can look and smell bad and may cause the water to appear green, red, brown, or blue in color; however, algal blooms can't always be seen.

This page has been created to help water and wastewater utilities stay informed about recent cybersecurity threats.